Dual Boot Installation with Windows 7 and XP
When you install Win7 last after the legacy OS's or itself, it will auto-configure a Windows-managed Multi-Boot menu.
If for some reason this doesn't work or you already have OS's which need configured into Dual- or Multi-Boot Menu, install EasyBCD 2.0 and add the missing OS's on its Add OS tab. Welcome to EasyBCD 2.0! — The NeoSmart Files
If you have further problems please post back a screenshot of your full Disk Management drive map and listings and the EasyBCD listings, using Snipping Tool in Start Menu.